143:(hence the power) that flows between them. Therefore voltage is a more local phenomenon, and grid-friendly devices that respond to voltage will support more local aspects of the electric delivery system. However, load types such as thermally protected induction motors and power electronics can respond poorly to significant voltage changes. When a sufficient fraction of the power demand in a region is composed of such loads, their collective response can lead to fault-induced delayed voltage recovery behavior, which may have adverse effects on transmission system reliability and may require mitigation to avoid initiating system outages.
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residential appliances did automatically detect grid problems expressed as frequency deviations and reduced energy consumption at critical moments. The
Olympic Peninsula demonstration showed that residential, commercial, and industrial loads did adjust their consumption patterns based on price signals emanating from a distribution-level market operated as a double action. Both of these projects showed how grid-friendly technologies can and do reduce pressure on the electric grid during time of peak demand.
105:) when the frequency drops below a certain threshold, and/or increasing load when the frequency rises. Although a single grid-friendly device may be a very small load, the fraction of the total load that can be controlled by frequency at any time is usually sufficient to provide under-frequency protection to the system before more drastic measures like black-outs are required.
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electricity prices that change over time, rather than fixed for months or years. In general, higher prices occur at times when the electric system is running short of supply. The purpose of grid-friendly price response is to promote demand response among electricity consumers. Demand response is one means of reducing the
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The advantage of grid-friendly frequency response is that frequency is ubiquitous on an electric system. When a generator shuts down in one part of the system, all the loads everywhere in the system can simultaneously detect the change and respond instantly and appropriately without the need for a
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While frequency and voltage respond to physical phenomena on the electric system, grid-friendly price response is designed to address economic phenomena. With the increasing application of electricity markets to manage the efficient distribution of electric power, more consumers are exposed to
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in 2006 and 2007 in the
Northwest region of the United States. Participants included local utilities, residential and commercial customers, industrial loads belonging to municipalities, and a number of vendors and researchers. The grid-friendly technology demonstration showed that common
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produced by the generators exceeds the power used by the customers, the frequency of the electricity rises. Conversely, when the amount of electric power produced is less than what is consumed, the frequency drops. Therefore frequency is an accurate indicator of the system-wide (called
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of electricity suppliers when production runs short. Grid-friendly response to price also allows consumers to reduce their energy costs by using less electricity when prices are high, and more electricity when prices are low.
304:; Hammerstrom, D.J.; "Design Considerations for Frequency Responsive Grid Friendly Appliances," Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES, vol., no., pp.647-652, 21–24 May 2006
290:; Hammerstrom, D.J.; "Design Considerations for Frequency Responsive Grid Friendly Appliances," Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES, vol., no., pp.647-652, 21–24 May 2006
276:; Hammerstrom, D.J.; "Design Considerations for Frequency Responsive Grid Friendly Appliances," Transmission and Distribution Conference and Exhibition, 2005/2006 IEEE PES, vol., no., pp.647-652, 21–24 May 2006
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D. Hammerstrom et al. (2007). Pacific
Northwest GridWise Testbed Demonstration Projects Part II. Grid Friendly Appliance Project. PNNL no. 17079, Pacific Northwest National Laboratory, Richland, Washington
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D. Hammerstrom et al. (2007). Pacific
Northwest GridWise Testbed Demonstration Projects Part II. Grid Friendly Appliance Project. PNNL no. 17079, Pacific Northwest National Laboratory, Richland, Washington
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D. Hammerstrom et al. (2007). Pacific
Northwest GridWise Testbed Demonstration Projects Part I. Olympic Peninsula Project. PNNL no. 17167, Pacific Northwest National Laboratory, Richland, Washington
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D. Hammerstrom et al. (2007). Pacific
Northwest GridWise Testbed Demonstration Projects Part I. Olympic Peninsula Project. PNNL no. 17167, Pacific Northwest National Laboratory, Richland, Washington
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In contrast to frequency, voltage varies widely throughout electric systems, because it is the voltage difference between two devices that largely determines the direction and magnitude of the
39:; more sophisticated devices may alter their operating profile based on the current market price for electricity, reducing load when prices are at a peak. Grid-friendly devices can include
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Quint, R.; Kosterev, D.; Undrill, J.; Eto, J.; Bravo, R.; Wen, J. (July 2016). "Power quality requirements for electric vehicle chargers: Bulk power system perspective".
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D. J. Morrow, et al. (1991). Low-cost under-frequency relay for distributed load-shedding. In proc. of 3rd Int. Conf. on Power System
Monitoring and Control. 273-275.
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Z. Zhang, et al. (1999). An adaptive microcomputer-based load shedding relay. In conf. rec. of 34th IAS Annual Mtg. Industrial
Applications. 3: 2065–2071.
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D. P. Chassin, et al. (2005). Estimation of WECC system inertia using observed frequency transients. IEEE Transactions on Power
Systems. 20:2 1190–1192.
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utilizing self-regulation through emergence are generally more resilient and flexible than are simpler top-down command and control systems.
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Kundu, Soumya, and Ian A. Hiskens. "Overvoltages due to synchronous tripping of plug-in electric-vehicle chargers following voltage dips."
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A grid-friendly device can respond to changes in frequency by reducing or interrupting the demand for electric power (called
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Chen, Heng. "Cascaded stalling of induction motors in fault-induced delayed voltage recovery (FIDVR)."
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to deliver commands to millions of devices. This type of behavior changes frequency from a simple
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Pacific
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Grigsby, L. L., et al. The Electric Power Engineering Handbook. USA: CRC Press. (2001).
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control system to detect the problem, a control center to make a decision, or a
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US Department of Energy, Office of Electricity Delivery and Energy Reliability
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S. Stoft. Power System Economics. Wiley Interscience. IEEE Press. (2002).
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Voltage Level as Information Carrier in Smart Distribution Networks
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